import {ERR_OK} from '../../api/config'
import {getLyric} from '../../api/song'
import {Base64} from 'js-base64'

//创建一个类
export default class Song{
  constructor({id,mid,singer,name,album,duration,image,url}){
    this.id=id;
    this.mid=mid;
    this.singer=singer;
    this.name=name;
    this.album=album;
    this.duration=duration;
    this.image=image;
    this.url=url
  }
  getLyric(){
    if(this.lyric){
      return Promise.resolve(this.lyric)
    }
    return new Promise((resolve,reject)=>{
      getLyric(this.mid).then((res)=>{
        if(res.retcode===ERR_OK){
          this.lyric=Base64.decode(res.lyric);
          resolve(this.lyric);
        }else{
          reject('no lyric')
        }
      })
    })
  }
}

//工厂模式
export function createSong(musicData){
  return new Song({
    id:musicData.songid,
    mid:musicData.songmid,
    singer:filterSinger(musicData.singer),
    name:musicData.songname,
    album:musicData.albumname,
    duration:musicData.interval,
    image:`https://y.gtimg.cn/music/photo_new/T002R300x300M000${musicData.albummid}.jpg?max_age=2592000`,
    url:`http://ws.stream.qqmusic.qq.com/${musicData.songid}.m4a?fromtag=46`
  })
}

//过滤筛选
function filterSinger(singer) {
  let ret=[];
  if(!singer){
    return ''
  }
  singer.forEach((s)=>{
    ret.push(s.name)
  })
  return ret.join('/')
}
